Science : Ch 11 – The Human Eye and the Colourful World

Which of the following statements is correct regarding the propagation of light of diferent colours of white light in air?

The red colour of the sun at the time of sunrise and sunset is because:

The sun appears red at sunset or sunrise. Choose the incorrect statement from the following

Arjun remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,Name two observations which can be explained by the above phenomenon.

Why don’t planets twinkle?

What would have been the colour of sky if the earth had no atmosphere

Milk is a colloid that contains globules of fat and protein. When a beam of light is directed at a glass of milk the light is scattered. That is a great example

Power of a lens is

Light which consists of only one colour or single wavelength is called Monochromatic

Why is red used as the stopping light at traffic signals?

The effect seen Color of the sky during Sunrise and Sunset

The density of the atmosphere, as we know goes on decreasing as the distance above the sea level increases,this phenomeneon is called

The defect in a person can see nearby objects but not far away objects

When a person can see faraway objects but not nearby objects.

Rainbow is caused due to